Drawing-die for sheet metallic strips.



G. W. PROHLICH. DRAWING DIE FOR SHEET METALLIC STRIPS APPLICATION rum: rmma, 1914.

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APPLICATION FILED IEB.13, 15114- Patented Dec. 1,1914.

2 SHEETS-$11111?! 2.

GEORGE W. FROHLIGH, OFCHICAGO,

ILLINOIS.

DRAWING-DIE FOR SHEET METALLIC STRIPS.

Specification of Letters Patent.

Patented Dec. 1, 1914..

Application filed February 13, 1914. Serial No. 818,528.

I '0 all whom it may concern:

Be it known that I, GEORGE W. FROHLICH, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Drawing-Dies for Sheet Metallic Strips; and I do hereby declare that the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates generally to improvements in a drawing die for sheet metallic strips, and it consists, essentially, in the novel and peculiar combination of parts and details of construction, as hereinafter first fully set forth and described and then pointed out in the claims.

In the drawings already referred to which serve to illustrate my invention more fully, Figure l is a side elevation of my newly improved draw bench die for shaping sheet metallic strips. Fig. 2 is a front elevation.

in the direction of the arrow pointers 2-2 in Fig. 1. Fig. 3 is a horizontal section in the direction of the arrow pointers 3-3 in Fig. 1. Fig. 4 is a cross section of a fragment of my device in line H of Fig. 1. Fig. 5 is a similar section in line 5--5 of Fig. 1, and Fig. 6 a like section in line 66 of Fig. 1. Figs. l, 5 and 6 are merely intended to show the variation in cross sectional contour of the opening through the die wherethrough the strip material is drawn to the desired shape. Fig. 7 is a sec tion projected at right angles taken in line 77 of Fig. 3. Fig. 8 is an elevation and Fig. 9 a cross section of one of the many shapes into which strip material such as soft bright cold rolled steel, zinc, brass, or copper may be drawn. Fig. 10 is a front elevation of a die provided with rollers to produce a more finished product. Fig. 11 is a section in the direction of the arrow pointers in line 1111 of Fig. 10. Fig. 12 is a section in the direction of the arrow pointers in line 12-12 of Fig. 11. Fig. 13 is a diagramic view of rollers with their spindles in the same vertical plane located in die B hereinafter referred to, to produce an H-shaped bar, and Fig. 14 a similar diagram of rollers adapted to produce H-shapecl bars with knurled beads centrally of the flanges shaping of strip sheet metallic material into contours of various cross sections for use as metallic sash for fancy windows in substitution of what is known as leaded sash. This sash is essentially of I-shape more or less as indicated in Fig. 9, comprising a double web a and a and a pair of flanges b and 22. Of course almost countless variations of the shape of the flanges may be produced, dependent upon the artistic effect desired. The material from which this sash is drawn is generally strip zinc of a width equaling the length of the outer contour of the finished strip, minus a slight stretch in the material while being shaped in the draw die. l'leretofore this zinc was only produced in short lengths of approximately eight feet. During that period it was the practice to pass the strips through a series of dies to complete the finished section, as in Figs. l, 5, and 6, the first named indicating the initial draw or rough outline, the next, the

intermediate, and Fig. 6 the more or less completed shape, the final operation being through a die which squeezed the webs a and a. closely together.

With the beginning of manufacture of strip zinc in lengths of from 100 to 1000 feet furnished rolled upon suitable reels, the introduction of new methods of shaping became necessary. Hence my invention contemplates theshaping of the finished article through a series of steps in a single compound die. It is now to be understood that these dies are mounted upon a so called draw bench such, for instance, as that disclosed in my co-pending application, Serial No. 823,983, filed March 11, 191 1, in which an endless traveling means of suitable length is provided with pickups to grasp the free end of the strip which has been passed through the die and draw it to the farther limits of the bench, when the strip is cut and a succeeding pickup continues the drawing process, so that single strips of from 50 to 100 feet long may be drawn and afterward cut to the desired lengths. But, while zinc is a moderately soft material, it

at the same time possesses a certain degree of friability. The rapid changes in the cross sectional shape of the material as it was drawn through the shaping dies under considerable tension creates a molecular change in the structure of the material, which causes it to often crack in the corners of the flanges while being passed through the final or finishing die. It thus became necessary to provide means for rapidly easing off the finishing die until such a cracked spot was passed when the die was again closed, all this being done without arresting the passage of the material. The provision of the easing and tightening means for the final die, rapidly and efliciently, is therefore one of the objects of my invention; another end sought in easing off said die is to facilitate the passage therethrough of the strip after it leaves the next previous die. If saidfinishing die were not eased off or opened the material in its only partially shaped condition would begin to buckle up at the rear face of said die, but being opened, the material is permitted to pass through without its final shape for a small distance, when the die is closed and the stock squeezed to final shape.

To better understand my invention 1 now refer to the drawings, in which- A is the die in which the initial shapes indicated in Figs. 4, .5, and 6 are successively imparted to the strip as it is drawn therethrough. This die is composed of two 'ss rectangula'r blocks of steel 1 and 2 tightly screwed together by screws 3. Centrally of these blocks at the line of j ointure thereof is formed a through opening 5 tapering in cross sectional shape from that shown at the front or entering face 6 of the die to 7, Fig. 6 near the opposite face 8 thereof. The interior face of this die is lapped to a high finish and perfectly smooth to reduce the liability of tearing the strip material as it passes through. Centrally of this open, ing and extending its entire length there is a shaping mandrel 9. This mandrel is maintained in place by means of a necked shank 10 fitting an oblong through slot 11 located in block 2, parallel to opening 5. This shank and its slot 10 are very slightly tapered so that as the material is drawn through, the mandrel 9 is advanced by friction to its proper position, while by the application of a slightly tapered key (not shown) between the face 6 and a nose 12 on the shank 10 the mandrel may be instantly withdrawn. The object of making die A in two halves 1 and 2 is to facilitate the machining, polishing and finishing the through opening 5 in an evident manner.

Spaced from die A by two spacing blocks 13 and 14 and maintained in rigid connec tion to said die by means of screws 15 is the finishing lie 13, composed of two reetangue larblocks 16 and 17, fastened together'by lower flange portions 1) and b, Fig. 9, are

formed by the openings 21 and 22 in the steel blocks 16 and 17, respectively, but the flange portions a and a of the strip are.

closed together by inserted jaws 23 and 24. Jaw 24 is rigidly maintained in a suitable slot in blocks 16 and 17 but jaw 23 is oscillatably held therein as clearly indicated in Fig. 3 by means of a pivot pin 25.

Suitably located in block 2 and extending therethrough from front to rear is an oscillatable shaft 26, having an operating handle 27 located" adjacent face 6 of die A and extending therebeyond. In the space between dies A and B said shaft 26 has a crank arm 28, which engages a stud 29 fastened at the back of jaw 23. It will be observed that as the handle 27 is properly manipulated the jaw 23 is rotated toward the'die A and the width of the opening .19,-Fig. 3 greatly increased, permitting the free passage therethrough of webs a and a of the sash bar 20 for the purposes hereinbefore disclosed.

\{Vhen it is necessary to produce a sash strip having a nicely planished surface instead of having fine longitudinal scratches due to perhaps a slight roughness of the die or to a slight roughness in the face of the zinc, I employ dies constructed as in Figs. 10, 11 and 12, in which the jaw 24, of the finishing die B is slotted as seen at 100 and provided with a perfectly smooth planishing wheel 101. The width of the oscillatable jaw 23 and its retainingslot 23 is made of equal size as the jaw 24 and is provided with a like planishing wheel 102, the adjacent peripheries of which wheels form the sides of opening 19. Jaw 23 is oscillated as before by the stud 2 9, crank arm 28, shaft 26, and handle 27.

In the body of the die A, above and below the through opening ,5, nearly adjacent the face 8 of said die are formed recesses 103 and 104 for the reception of planishing wheels 105 and 106 for the top and bottom flanges Z) and b of the sash bar. These wheels are mounted ,on pins 107 and 108 and produce a fine smooth finish upon the said top and bottom flanges of the strip,'while the wheels 101 and 102 perform the same servicefor both sides of the flange section of the bar. This form of die construction has another advantage in that the 110 to a finger guide 111. Occasionally the strip of zinc to be shaped does not squarely meet the opening 5, wherefore the operator catches this finger guide and zinc strip between thumb and forefinger and assists in the entrance of said strip. The guide is made oscillatable for the reason that at times better results incausing the strip to enter the opening are secured by pitching the guide slightly upward at the outer end, and under other conditions the process is facilitated by dropping the end of the guide.

In Fig. 13 I show four wheels 110, 111, 112, 113, all located in the same vertical plane. Wheels 110 and 111 are pivoted in jaws and 24 respectively, while the wheels 11? and 113 are journaled in the lower and upper halves 16 and 17 of finishing die B. This procedure will produce a cleanly planished sash bar of H-shape without any scores or scratches in the surface thereof.

In Fig. 14 I disclose two wheels 11% and 115 instead of wheels 112 and 113. These latter are possessed of knurled grooves 116, whereby there is produced on the flange portions of the sash bar semi circular knurled beads for purposes of ornamentation.

It is to be understood that I may employ wheels of various peripheral contours to produce such flange shapes as may be desired.

While herein I have disclosed the preferred mode of practicing my invention, I. desire it understood that I may make such changes and alterations therein as would suggest themselves to the skilled mechanic or be permitted under the doctrine of mechanical equivalents.

Having thus fully disclosed my invention I claim as new and desire to secure to myself by Letters Patent of the United States 1. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a finish shaping die fixed to said first named die,but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw, said means being located between said dies and operable from the exterior of the initial shaping die.

2. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw, said means comprising a crank arm located between said dies, engaging said jaw. a shaft in said initial die connected to said crank arm, passing through said die, and an operating handle on said shaft outside of said die.

3. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a pivoted adjustable guide finger on said mandrel outside of said die, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw.

47. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a pivoted adjustable guide finger on said mandrel outside of said die, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw, said means being located between said dies.

5. A device of the class described comprising an initial shaping die and a shaping mandrel therein, an adjustable guide finger on saidmandrel outside of said die, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw, said means being located between said dies and operable from the exterior of the initial shaping die.

6. A device of the class described com prising an initial shaping die and a shaping mandrel therein, an adjustable guide finger on said mandrel outside of said die, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw, said means comprising a crank arm located between said dies, engaging said jaw, a shaft in said initial die connected to said crank arm, passing through said die, and an operating handle on said shaft outside of said die.

7. A device of the class described comprising an initial shaping die and a shaping mandrel, planishing rollers adjacent both edges of said mandrel and located within said die, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw.

8. A device of the class described comprising an initial shaping die and a shaping mandrel, planishing rollers adjacent both edges of said mandrel and located within said die, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oseillatable shaping jaw, and means for oscillating said jaw, said means being located between said dies.

9. A device of the class described comprising an initial shaping die and a shaping mandrel, planishing rollers adjacent said mandrel, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw, said means being located between said dies and operable from the exterior of the initial shaping die.

10. A device of the class described comprising an initial shaping die and a shaping mandrel, planishing rollers adjacent said mandrel, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, and means for oscillating said jaw, said means comprising a crank arm located between said dies, engaging said jaw, a shaft in said initial die connected to said crank arm, passing through said die, and an operating handle on said shaft outside of said die.

11. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, a planishing roller in said jaw, and means for oscillating said jaw whereby a greater or lesser pressure may be applied to a sheet metallic strip passing through said last named die.

12. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, a planishing roller in said jaw, and means for oscillating said jaw, whereby a greater or lesser pressure may be applied to a sheet metallic strip passing throu h saidlast named die, said means 10- cated%3etween said dies.

13. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an OS- cillatable shaping jaw, a planishing roller in said jaw, and means for oscillating said jaw, said means being located between said dies and operable from the exterior of the initial shaping die.

let. A device of the class described comprising an initial shaping die and a shaping mandrel therein, a finish shaping die fixed to said first named die but spaced therefrom, said finish shaping die having an oscillatable shaping jaw, a planishing roller in said jaw, and means for oscillating said jaw,

said means comprising a crank arm located between said dies, engaging said jaw, a shaft in said initial die connected to said crank arm, passing through aid die, and an operating handle on said shaft outside of said die.

In testimony whereof T have hereunto set my hand in the presence of two subscribing witnesses.

GEORGE WV. FROHLIOH.

In the presence of VVILLIAM O. STONE, WV. HARDING.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, D. G. 

